\pgfkeys{/tikz/.cd,
	vertical factor/.initial=0.5,
	vertical factor/.get=\vertfactor,
	vertical factor/.store in=\vertfactor,
	start coordinate/.initial=

		{0,\vertfactor

		},
	sample line width/.initial=very thick,
	start coordinate/.initial =

		{another/. style={

					0,\vertfactor

				}

		},
	sample line width/.get=\samplelinewidth,
	start coordinate/.initial=

		{0,\vertfactor

		}

		{something else

		},
}
